At about 9:30 p.m. Port Authority officers received a call saying there were shots fire at American Airlines' Terminal 8 departures. Police have confirmed there were no shots fired, but it is still not clear what led to the chaos.

As a safety precaution, Terminals 1 and 8 were closed as officers swept the area. The airport was also under a security ground stop. Police searched and cleared all terminals just before midnight, but did not find anything. All affected terminals were expected to resume operations.

Photos posted on social media show crowds gathering as the terminal was evacuated. Credit: @jewishbreakingnews/Twitter

American Airlines released a statement Sunday night saying, "We are aware of an ongoing security situation at the JFK. There are no known injuries to our employees or passengers at this time and our ticket counter is currently closed. We will provide additional details as they become available."